It takes about 20 seconds for a red blood cell to circle the whole body.
102
You can't tickle yourself.
29
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
The human brain is more active during sleep than during the day.
28
Poor eyesight (myopia) is associated with higher IQ.
232
Gorillas can catch human colds and other illnesses.
205
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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